EP3872297A1 - Verfahren zur behandlung einer durchlässigen unterirdischen formation mit einem harz - Google Patents

Verfahren zur behandlung einer durchlässigen unterirdischen formation mit einem harz Download PDF

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Publication number
EP3872297A1
EP3872297A1 EP20159600.4A EP20159600A EP3872297A1 EP 3872297 A1 EP3872297 A1 EP 3872297A1 EP 20159600 A EP20159600 A EP 20159600A EP 3872297 A1 EP3872297 A1 EP 3872297A1
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EP
European Patent Office
Prior art keywords
viscosity
resin
formation
fluid
water
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Application number
EP20159600.4A
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English (en)
French (fr)
Inventor
Erik Kerst Cornelissen
Gideon LANGEDIJK
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Shell Internationale Research Maatschappij BV
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Shell Internationale Research Maatschappij BV
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Application filed by Shell Internationale Research Maatschappij BV filed Critical Shell Internationale Research Maatschappij BV
Priority to EP20159600.4A priority Critical patent/EP3872297A1/de
Priority to PCT/EP2021/054476 priority patent/WO2021170593A1/en
Publication of EP3872297A1 publication Critical patent/EP3872297A1/de
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
    • E21B43/02—Subsoil filtering
    • E21B43/025—Consolidation of loose sand or the like round the wells without excessively decreasing the permeability thereof
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K8/00—Compositions for drilling of boreholes or wells; Compositions for treating boreholes or wells, e.g. for completion or for remedial operations
    • C09K8/56—Compositions for consolidating loose sand or the like around wells without excessively decreasing the permeability thereof
    • C09K8/57—Compositions based on water or polar solvents
    • C09K8/575—Compositions based on water or polar solvents containing organic compounds

Definitions

  • the present invention relates to a method of treating a subsurface permeable formation with a resin.
  • Sand control in hydrocarbon production industry refers to managing and/or minimizing sand and fines production during production of hydrocarbons (oil and/or gas) from subsurface Earth formations.
  • Various methods of sand control and consolidation have been developed and applied in the past, but sand control is still considered to rank amongst the top technology challenges as various methods are quite expensive to apply.
  • Such methods include completion methods, including valves or screens.
  • Swellable packers have also been used for zonal isolation and water shut off.
  • a moisture curable urethane elastomer has been proposed in J. of Petroleum Technology Vol. 18(3), pp. 306-312 (March 1966 ), to consolidate formation sand in a tough rubbery matrix.
  • a typical treatment consists of the injection of (1) a small value of kerosene or diesel oil to establish an injection rate, (2) a polyurethane solution, and (3) a diesel oil overflush to establish permeability.
  • the polyurethane is catalyzed by the formation water, which extends the placement time.
  • a remaining challenge is to retain as much of the permeability of the formation as possible.
  • a method of treating a permeable subsurface earth formation containing a formation fluid comprising formation water in pores within said permeable subsurface earth formation comprising:
  • one more properties, such as permeability, stability, and erodibility, of the permeable subsurface Earth formation may be modified.
  • the target formation is accessible from the Earth surface via a borehole.
  • one more properties of the permeable subsurface Earth formation may be modified.
  • the purpose would be to bond sand particulates in the formation while preserving sufficient permeability for subsequent production of hydrocarbon formation fluids through the remaining pores.
  • the present invention employs a preflush fluid to displace formation water, except for leaving behind water that has physisorbed onto the subsurface earth formation solids that are targeted to be consolidated. Subsequently, an uncured water-curable resin is forced into the formation.
  • the resin preferentially cures starting at the interfaces with the formation solids that are to be consolidated, as that is where the remaining formation water from the preflush step is located.
  • the resin essentially does not react with the preflush fluid in the pores, but a specific amount of time is selected before initiating the next step of injecting an overflush fluid, to allow the resin to react in close proximity to the grains of formation solids.
  • an overflush step wherein a resin-displacing overflush fluid is forced into the pores, whereby excess resin is dispersed further into the formation, away from the borehole.
  • the overflush fluid preferably is inert in that it does not react with the uncured resin.
  • the viscosity of the uncured resin is higher than the viscosity of the preflush fluid, for example between 2x and 10x higher. This facilitates an effective displacement of a complete front of the preflush fluid with the resin.
  • the viscosity of the overflush fluid may be higher than the viscosity of the excess (uncured) resin. This facilitates an effective displacement of a complete front of the excess resin with the overflush fluid.
  • the viscosity of the overflush fluid may be between 2x and 20x higher than that of the uncured resin.
  • the various viscosities are selected such that the viscosity of the overflush fluid does not have to exceed about 5 Pa ⁇ s.
  • the uncured resin viscosity may be in the range of from 0.08 to 0.8 Pa ⁇ s.
  • the viscosity of the preflush fluid is higher than that of the formation fluid which is originally present in the pores of the formation.
  • the viscosity of a typical pre-flush fluid for a light oil well or a gas well may for example be between 0.01 and 0.1 Pa ⁇ s.
  • the present invention uses water in the formation fluid, which is anyway present within the pores, as second component of the resin sealant system.
  • An uncured component of the resin is injected or otherwise forced into the pores.
  • the resin is cured in said pores by allowing a chemical reaction between the resin and remaining formation water which has physisorbed on the formation particulate that are targeted to be consolidated.
  • the solidified resin material can consolidate formation particles and alter reservoir properties.
  • each "component" of the resin sealant system may consist of a pure compound or comprise a mixture of compounds.
  • the first component is usually a functional resin portion of the resin sealant system, whereas the second component is acts as hardener.
  • the hardener is typically understood to be a separate ingredient that reacts with the functional resin portion of the first component.
  • the compounds within one "component” generally do not react with each other, in absence of other molecules.
  • the resin can thus have a very long shelf-life, as long as contact with the formation fluid and other fluids which may contain the relevant reactive molecules (e.g. water or moisture) is prevented. No resin will cure prematurely as long as the formation fluids or fluids containing the relevant reactive molecules are kept away from the resin.
  • relevant reactive molecules e.g. water or moisture
  • the resin will first start to cure subsequent to injection, as the second component is a formation fluid that is physisorbed on the surfaces of the pores into which the resin is injected.
  • the new resin pumped or injected, or otherwise forced into the formation pores, will have a well-defined and predetermined viscosity before injecting.
  • the resin is injected into the formation from a wellbore.
  • the wellbore may be well for an oil and/or gas, or a geothermal well application.
  • the formation fluid may be a hydrocarbon fluid, such as oil or natural gas, an aqueous fluid, such as water or brine, and combinations thereof.
  • the resin which is injected is water-curable whereby the formation fluid comprises water (typically in the form of brine).
  • Water curable (or moisture curable) resins are commercially available. Known prior application of such resins is found in certain glues and coating systems (paints) such as moisture cure urethane coatings (MCU coatings).
  • a suitable class of such water curable resins is based on isocyanates.
  • the organic molecules suitably comprise multiple functional isocyanate groups, such as di-isocyanates.
  • a well-known example of a di-isocyanate is methylene diphenyl di-isocyanate (MDI).
  • Such isocyanates chemically react with active hydrogen atoms which can be provided in alcohols, amines, amides, ureum, and also water. Under reaction with water, the iso-cyanates react and form both polymer molecules as well as ureum cross links between successive polymer molecules thus forming a three-dimensional network that can have excellent sand particulate bonding properties. The amount of carbon dioxide formed during the reaction is sufficiently small to not cause problems or leak paths.
  • a suitable water curable resin comprises an isomeric mixture of toluene-2,4-diisocyanate and toluene-2,6-diisocyanate, as disclosed in J. of Petroleum Technology Vol. 18(3), pp. 306-312 (March 1966 ).
  • Another example is polyurethane injection resin commercially available under the name "SpeTec ®” from Koramic Construction Chemicals, Wommelgem, Belgium. SpeTec ® Soil H40 is a single component resin which comprises an accelerator which can be pre-mixed.
  • SpeTech ® Soil H40 contains 4,4'-methylenediphenyl diisocyanate, propylenecarbonate, and difenylmethane-4,4'-diisocyanate and it has a dynamic viscosity of about 100 mPa.s at 25 °C as determined by Brookfield SP3 - 200 tr/min test.
  • the accelerator contains 2,2-dimorfolino diethylether.
  • the formation of the three-dimensional network is facilitated by displacing a majority of the formation fluid from the pores of the formation which is to be treated with a preflush fluid.
  • the chemical reaction can take place in a condition where there is excess resin during said chemical reaction compared to the formation fluid. Excess resin molecules are then forced to react with themselves rather than only with the formation fluid.
  • Fig. 1 schematically shows a cross sectional view of a so-called open borehole 1 in a formation rock 2 in the Earth.
  • an injection string 16 may be run into the borehole 1.
  • Resin injection strings can be run on a (coiled) tubing or in any other suitable manner.
  • the injection string 16 is provided with a set of straddle packers 8 to isolate a selected zone 10 from the remainder of the borehole.
  • the straddle packers 8 may comprise inflatable packers.
  • straddle systems such as for example TAM International's PosiFrac TM straddle system or Schlumberger's ACTive Straddle system, are known and commercially available in the industry.
  • the injection string 16 may comprise coiled tubing. Ports 9 are provided in the zone between the straddle packers 8 through which fluids can be injected from the string into the selected zone 10. Prior to setting the packers 8 and isolating the selected zone 10, the borehole 1 may suitably contain a completion fluid.
  • the uncured resin 7 is injected into the pores of the formation rock 2. Most of the fluid that was present in the pores (suitably a preflush fluid) may be displaced by and/or thereby be driven out by the resin 7.
  • the resin 7 is cured by allowing a chemical reaction between the resin 7 water that has physisorbed on the formation particulates.
  • Fig. 3 shows the borehole 1 with the treated zone after a post-flush step.
  • An inert fluid water free, e.g. oil
  • the end result is a permeable medium of resin-consolidated solids.
  • the packers 8 can be collapsed and the injection string can be pulled up.
  • the various fluids that are injected into the selected zone 10 can be pumped in a sequence of volumes one after another, separated by darts.
  • the darts are suitably configured with a rupture disk, so that a number of darts can be run in a train having different fluid slugs between them.
  • a laboratory test was done wherein a polyurethane resin was injected into a cuvette containing a sample of unconsolidated (loose) packed sand grains saturated with water. The resin was injected, thereby displacing most of the water. However, as the water wetted the surfaces of the sand particles, that is where the resin cured during injection with resident remaining water. Subsequent to injecting the resin, the sample was post-flushed with oil. The resulting sample consisted out of porous permeable consolidated sand.
  • the herein proposed sand control methods can be applied to hydrocarbon producing wells, as well as other types of wells such as geothermal wells.
EP20159600.4A 2020-02-26 2020-02-26 Verfahren zur behandlung einer durchlässigen unterirdischen formation mit einem harz Withdrawn EP3872297A1 (de)

Priority Applications (2)

Application Number Priority Date Filing Date Title
EP20159600.4A EP3872297A1 (de) 2020-02-26 2020-02-26 Verfahren zur behandlung einer durchlässigen unterirdischen formation mit einem harz
PCT/EP2021/054476 WO2021170593A1 (en) 2020-02-26 2021-02-23 Method of treating a subsurface permeable formation with a resin

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20159600.4A EP3872297A1 (de) 2020-02-26 2020-02-26 Verfahren zur behandlung einer durchlässigen unterirdischen formation mit einem harz

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EP3872297A1 true EP3872297A1 (de) 2021-09-01

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915232A (en) * 1974-08-27 1975-10-28 Exxon Production Research Co Method of consolidating incompetent formations
US4113015A (en) * 1977-05-30 1978-09-12 Shell Oil Company Process for treating wells with viscous epoxy-resin-forming solutions
US20070289742A1 (en) * 2006-06-16 2007-12-20 Halliburton Energy Services, Inc. Methods and compositions for well completion in steam breakthrough wells
US9840655B2 (en) 2013-09-20 2017-12-12 Halliburton Energy Services, Inc. Compositions and methods for forming and utilizing stable, single-component resin mixture

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3915232A (en) * 1974-08-27 1975-10-28 Exxon Production Research Co Method of consolidating incompetent formations
US4113015A (en) * 1977-05-30 1978-09-12 Shell Oil Company Process for treating wells with viscous epoxy-resin-forming solutions
US20070289742A1 (en) * 2006-06-16 2007-12-20 Halliburton Energy Services, Inc. Methods and compositions for well completion in steam breakthrough wells
US9840655B2 (en) 2013-09-20 2017-12-12 Halliburton Energy Services, Inc. Compositions and methods for forming and utilizing stable, single-component resin mixture

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
J. OF PETROLEUM TECHNOLOGY, vol. 18, no. 3, March 1966 (1966-03-01), pages 306 - 312

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